A retrievable short-term implantable vena cava filter

Abstract

The invention discloses a recoverable short-term implanting vena cava filter, and belongs to the technical field of implanting medical appliances. The recoverable short-term implanting vena cava filter includes a filter body and a guide wire arranged on a tail end of the filter body; the filter body includes a fixing portion attaching to a blood vessel wall and interception portions for intercepting thromboembolus and arranged on a front end of the fixing portion; the fixing portion and the interception portions of the filter body have holes for allowing blood to flow through; the fixing portion is of cylindrical spiral structure or a conical spiral structure which is formed by bending the flexible guide wire. The recoverable short-term implanting vena cava filter can be implanted from a femoral vein of a patient, the filter is released and can be operated under the guide of a handheld ultrasonic device; and the filter can be recovered by directly pulling the guide wire. The filter cansimplify a surgery operation process and a surgery condition demand. Second class hospitals and common doctors can complete implanting and recovering of the filter; and the filter is simple and safein surgery operation, is low in cost, can be widely promoted, and can save life of more patients.

Description

technical field [0001] The invention is used in the technical field of implanted medical devices, and in particular relates to a recoverable short-term implanted vena cava filter. Background technique [0002] Venous thromboembolism is a disease of the venous system caused by genetic molecular defects such as anticoagulant proteins, coagulation factors, and fibrinolytic proteins, or the presence of acquired risk factors for thrombosis. Includes deep vein thrombosis and pulmonary thromboembolism. [0003] Vena cava thrombosis mostly occurs in patients with lower extremity or pelvic abdominal surgery, severe trauma, acute infection, pregnancy, malignant tumor, and heart disease. Lower leg venous return pressure due to various reasons, increased blood viscosity, increased platelets and increased blood coagulation, when the vascular endothelium is slightly damaged, it can promote platelets to adhere to form platelet thrombus, and then fibrin deposition, thrombosis Increased, o...

AI Technical Summary

Problems solved by technology

[0004] Pulmonary embolism is an emergency with high clinical morbidity and mortality. In the United States, the annual number of symptomatic pulmonary embolism cases reaches 570,000-630,000, of which 200,000 lead to death. Although systemic anticoagulation therapy can achieve some curative effect, but There are still 3-20% recurrent pulmonary embolism, and anticoagulant therapy itself has 26% complications, 5-12% of which are fatal complications; some patients cannot accept anticoagulant therapy, such as acute bleeding, peptic ulcer, Primary or metastatic tumors (especially intracranial tumors), pregnancy, before surgical treatment, etc.

[0005] In the early 1960s, a variety of special instruments for the inferior vena cava began to appear to solve this problem, such as the Adams-DeWesse inferior vena cava clip, which divides the inferior vena cava into small vein channels (4 channels with a diameter of 3mm), although it can make the pulmonary artery Embolism drops to 2-4%, but the incidence of inferior vena cava embolism and congestion is high (53%), and the complications of surgical placement of this device are high (9-27%)

[0014] 1. The cost is too high: most of the current market prices of venous filters are above 16,000 yuan, combined with the clinical cost, it is close to 20,000 yuan, and the actual use time is relatively short, which accounts for a relatively high proportion of the overall treatment cost

[0015] 2. DSA dependence: Both installation and removal need to be completed under the DSA system, and both require corresponding preparations during the perioperative period, and are also limited by the timetable of the cath lab

[0016] 3. The planned course of treatment cannot be met in clinical use: At present, it is not recommended to use the temporary filter for too long, which will cause serious adhesion. However, in actual clinical treatment, the risk of pulmonary embolism is often not eliminated within the planned course of treatment, and the filter needs to be extended residence time, and even eventually lead to the use of a temporary filter as a permanent filter

[0018] 5. Contradictions of anticoagulation: No matter permanent or temporary filter, anticoagulation is needed. However, some patients have bleeding tendency, such as combined gastrointestinal bleeding, there is often a contradiction between bleeding and anticoagulation treatment

[0019] 6. The scope of application is limited: due to high cost, inconvenient installation and removal, and many complications, the existing "Guidelines" strictly limit the indications for use of temporary filters

However, there are some patients clinically, if early thrombolytic therapy can be provided under the protection of a temporary filter, the long-term effect will be more ideal, forming a prominent contradiction between cost, risk and benefit

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